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Derivative Financial Instruments (Details 1) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Derivative Instruments and their Balance Sheet Classifications  
Derivative Assets$ 42$ 47
Derivative Liabilities5523
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Designated as Hedging Instrument [Member]
  
Derivative Instruments and their Balance Sheet Classifications  
Derivative Assets2328
Foreign exchange contracts [Member] | Prepaid and other current assets [Member] | Not Designated as Hedging Instrument [Member]
  
Derivative Instruments and their Balance Sheet Classifications  
Derivative Assets147
Foreign exchange contracts [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
  
Derivative Instruments and their Balance Sheet Classifications  
Derivative Assets512
Foreign exchange contracts [Member] | Accrued liabilities [Member] | Designated as Hedging Instrument [Member]
  
Derivative Instruments and their Balance Sheet Classifications  
Derivative Liabilities3712
Foreign exchange contracts [Member] | Accrued liabilities [Member] | Not Designated as Hedging Instrument [Member]
  
Derivative Instruments and their Balance Sheet Classifications  
Derivative Liabilities1010
Foreign exchange contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
  
Derivative Instruments and their Balance Sheet Classifications  
Derivative Liabilities81
Designated as Hedging Instrument [Member]
  
Derivative Instruments and their Balance Sheet Classifications  
Derivative Assets2840
Derivative Liabilities4513
Not Designated as Hedging Instrument [Member]
  
Derivative Instruments and their Balance Sheet Classifications  
Derivative Assets147
Derivative Liabilities$ 10$ 10